| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | not have been [verb] for | 15 |
|
| 2 | [not/n't] have been [verb] for | 15 |
|
| 3 | [not/n't] have been [vb pp] for | 14 |
|
| 4 | [not/n't] have been [v-ing] for | 5 |
|
